AquaSPArkle Immerse has been designed to remove the grease and oils that build up on the filter cartridge and can lead to impaired filtration. For best results, use on a monthly basis. Apply the 100g sachet to a clean bucket containing clean water to form a highly effective filter cleaning solution. Leave the cartridge to soak for a minimum of 8 hours. For best results, allow the cartridge filter to dry before putting back into operation.